Datasheet

Section 10 I/O Ports
Page 642 of 1408 R01UH0309EJ0500 Rev. 5.00
Sep 24, 2012
H8S/2456, H8S/2456R, H8S/2454 Group
10.12 Port D
Port D is an 8-bit I/O port that also has other functions. Port D has the following registers.
• Port D data direction register (PDDDR)
• Port D data register (PDDR)
• Port D register (PORTD)
• Port D pull-up MOS control register (PDPCR)
• Port D open drain control register (PDODR)
10.12.1 Port D Data Direction Register (PDDDR)
The individual bits of PDDDR specify input or output for the pins of port D. PDDDR cannot be
read; if it is, an undefined value will be read.
Bit Bit Name Initial Value R/W Description
7 PD7DDR 0 W
6 PD6DDR 0 W
5 PD5DDR 0 W
4 PD4DDR 0 W
3 PD3DDR 0 W
2 PD2DDR 0 W
1 PD1DDR 0 W
0 PD0DDR 0 W
• Modes 1, 2, and 4 Modes 3 and 7 (EXPE = 1)
Port D is automatically designated for data
input/output.
• Modes 3 and 7 (EXPE = 0)
Port D is an I/O port, and its pin functions can be
switched with PDDDR.